public EventsController()
{
_timer = _timer ?? new Timer((s) =>
{
_timer.Change(Timeout.Infinite, Timeout.Infinite);
using (var context = new ImageEntryContext())
{
foreach (var c in _clients)
{
try
{
var image = context.Images.Include(i => i.Comments).First(i => i.Id == c.ImageId);
var lastComments = image.Comments.Where(comment => comment.Id > c.LastMessage);
if (lastComments.Any())
{
c.StreamWriter.WriteLine("data:" +
JsonConvert.SerializeObject(lastComments.ToArray()));
c.StreamWriter.WriteLine();
c.StreamWriter.Flush();
c.LastMessage = lastComments.Max(lc => lc.Id);
}
c.StreamWriter.WriteLine("data:" +
JsonConvert.SerializeObject(new { Likes = image.Likes }));
c.StreamWriter.WriteLine();
c.StreamWriter.Flush();
}
catch
{
_clients = new ConcurrentQueue <Client>(_clients.Where(client => client != c));
}
}
}
_timer.Change(1000, 1000);
}, null, 0, 1000);
}
public ActionResult Image(int id, string username, string comment)
{
var c = new Comment()
{
Content = comment, User = username
};
ImageEntry image;
using (var context = new ImageEntryContext())
{
image = context.Images.Include(i => i.Comments).First(i => i.Id == id);
image.Comments.Add(c);
context.SaveChanges();
}
return(View(image));
}
public HttpResponseMessage Get(HttpRequestMessage request, int id)
{
int lastCommentId = 0;
using (var context = new ImageEntryContext())
{
lastCommentId = context.Images.Include(i => i.Comments).First(i => i.Id == id).Comments.Max(c => c.Id);
}
var client = new Client()
{
ImageId = id, LastMessage = lastCommentId
};
var response = request.CreateResponse();
response.Content = new PushStreamContent((s, c, t) =>
{
var writer = new StreamWriter(s);
client.StreamWriter = writer;
_clients.Enqueue(client);
}, "text/event-stream");
return(response);
}
